Spindle driving transmission



-lJ a INVENTOR$ Ms. M BY Jan. 11, 1938. c. E. LINDEN ET AL 2,105,283

I SPI NDLE DRIVING TRANSMISSION Filed May 22, 1935 5 Sheets-Sheet l Jan. 1 l, 1938. c. E. LINDEN ET AL SPINDLE DRIVING TRANSM ISS ION 5 Sheets-Sheet 2 Filed May 22, 1935 INVENTOREI V M 51 M 1 @MAZ ATTORNEY$ LlllllllllllllIl'lll' I1] C. E. LINDEN ET AL SPINDLE DRIVING TRANSMISSION Jan. 11, 1938.

Filed May 22, 1955 5 Sheets-Sheet M MEN-TOR; pnym/m ndfi4yc M ATTORNEYS Jan. 11, 1938. c; E. LINDEN ET AL SPINDLE DRIVING TRANSMISSION Filed May 22, 1955 5 Sheets-Sheet 4 INVENTOR5 'BY /V.%; I

ATTORNEYS 5 Sheets-Sheet 5 450 MOTOR 490 (s P/NDLE 1200/7070]? 1200 SP/N046 Mi W ATTORNEYS 2 u D N 5 RM S H L on 4 12 s R m m m 4 v w M 9 5 Hm 61 W mm Jan. 11, 1938. c. E. LINDEN El AL I I SPINDLE DRIVING TRANSMISSION Filed May 22, 19 35 "UNITED STATES Patented Jan. 11, 1938 r": wr

PATENT OFFICE SPINDLE DRIVING TRANSMISSION Carl E. Linden, Norwood, and Raymond H. Mc- Clellan, Hamilton, Ohio", assignors to The Fosdick Machine Tool Company, Cincinnati, Ohio,

a corporation of Ohio Application May 22, 1935,.Serial No. 22 ,794

5 Claims. (cite-477) This invention relates to improvements in speed control devices, and is particularly directed to a motor driven gear transmission for use in driv- :ing drillspindles or the like.

It is the object of this invention to provide-an electric motor driven transmission by means of which a wide range of speeds can be provided; in

l which the speedsimparted to the driven part through motor speed control and gear shifts may v lever, the usual range of speedsof the motor being,

be automatically controlled by means of a single jautomatically. multiplied through the common lever; and in which the shifting of gears in conjunction with the operation of the speed control means for theielectric motor is accomplished without. clashing of the gears by control apparatus slowing down the motor as the gear shifts are 1 made.

With these objectives in mind, the present embodiment of the invention may include a multiple or .variable speed controller for the motor, a gear transmission between the motor and thepart being driven, and a single lever controlling the motor speed controller'and the gear shift, whereby the 2 .35;

.. as to rate, and are controlled from one lever. The "improved constructionlcan be applied so as to multiply the electric motor speeds any number speeds obtained in the driven part are in sequence of times through appropriate gear shifts interconnected or operated mechanically with the -operation of themotor controller for raising o-r samesequence as to rate. motor selected may be capable of operation, for

lowering the speeds of the motor upon each'gear shift always delivering themotor speed in'the In other Words, the

example, atfour different speeds, which speeds are delivered to the driven part through a trans- -missionwhich may step the motor speed range:

up or. down as the case may be, but which will always deliver the ranges of motor speed so that .the ultimate speeds at the driven part are constantly increased or decreased in rate. I

Other objects and further advantages will, be

, morev fullyqapparent from a description of the accompanying drawings, in which:

Figure 1' is aperspective-view of a drill incorporating the present improvements.

. ,..Figure ,2 is an enlarged top plan view of the drill, a portion thereof being broken away for the purpose of showing the connectionof thecon- .atrol shaft to themotor controller switch shaft. Figure 3 is a sectional view taken on line 3-3, ;-;Fig. 2, detailing the drive transmission from the motor to the spindle shaft.

. Figure 4 is a sectional view taken on line 4 l,

Fig. 3, further detailing the transmission and the back gear shifting device. 1

Figure 5 is asectional view taken on line 5-5,

Fig. 2, detailing the control lever operating connection to the switch and gear shifting shaft.

Figure 6 isa sectional View taken on line 66, Fig. 3, illustrating the details of the back gear shifting. mechanism and the positioning detents for the controller.

Figure '7. is a sectional view taken on line 1-1, Fig. 6, further detailing the shifting mechanism.

Figure 8 is a sectional View taken on line 8-8,'

Fig. 4, showing the details of the back gear support element.

=Figure 9 is a diagrammatic View illustrating the relation ofthe back gear shifting device and the controller switch for the motor showing the dial a the switch and illustrating by legends the motor and spindle speeds and the range of the back gear shift.

For the purpose of illustration, the improvements-conjcerned in this application have been applied to a drill of the following construction. A

column I5 islmounted on a base 16 and carries apower transmission head ll at its upper end and a drill'head unit l8 slidably supported on the forward side of-the column on vertical ways [9. A work supporting table 20 is suitably mount- ,ed' on the column and the base directly beneath the head l8. Suitable means are provided for adjustably supporting the head and for feeding the same vertically on the column.

The toolspindle 2|,vertically downwardly disposed from the head, is driven by meansof a shaft 22 extended upwardly from the spindle and thehead and having splined connection with the transmission in the head at the top of the column. All of-thepresent improvements relate tothe motordriven, transmission for the spindle driving shaft 22 and accordinglythe detailed description will be confined to the structure at the top of the column.

' Ellie transmission head casing structure incorporates three chambers, namely, a transmiseight in the present instance.

sion casing or chamber 23, a motor chamber casing 24, and a controller switch chamber 25. As shown, in Figures 2 and 3, the motor chamber 24 is extended upwardly from the transmission chamber 23 and the controller switch chamber 25 is extended rearwardly from the transmission chamber.

In general, the structures embodied in these three casings is as follows: A motor 26' in the chamber 24 drives the shaft 22 either directly or through back gearing. The motor speed is controlled by means of a switch Z'Ifhavingduplicate sets of contacts in this embodiment. The speeds of the motor as controlled by the switch'maybe of any number and in this instance happento be four. The range of delivered speeds is doubled by the use of the back gearing. A single lever 28 operates the controller switchand-the back-gearing shiftable gears for the purpose of setting up twice the number of motor speeds, namely, One complete swing of the lever moves the 'control mechanism through eight delivered speeds. -.Inldoing so it rotates the controller switch once, operating the backgear for shifting from directdrive 'to back gearing drive between the sets of "contacts of the switch. It is alsoprovided by arrangementon the controller switch thatprior to or at the time of meshing or shifting from-back geardrive to directdrive, the motor speedis lowered so as to lessen clashing ofithe gears.

- spindle shaft 1 22.

Specifically describing the structure heretofore generally outlined, the motornis' vertically disposed in its casing and has its lower end (see Figure 3) journalled'in a ball bearing mounted in a bearing support element: 30 of .the transmis- "sion casing. The motorshaft fll ishollow for by centrifugal forcethroughradialtubular arms rotating in the plane of apertures in the-motor housing 36. i

The -assembly of the gear arid:fan,and the mounting of the lower end of theshaft' onthe transmission housing is accomplished 'in 'the following manner. A sealing sleeve 3'l-is fixed on -the motor shaft between the fan element and the ball bearing. A nut 38 on thescrew threaded lower end of the motor shaft,-when drawn up,

" engages the'gear 33 tightly against-the inner race of the ball-bearing from beneath and the fan 34 and sealing sleeve 31 against the upperside-of the inner race of the ball bearing from above, thus clamping all elements to the inner'race of the ball bearing;

Thesealing sleeve includes a circular flange 39 having depending concentric'circular lugs- 40 engaged in annular grooves 4| in the horizontal top surface of the bearing support sleeve.

--As wi1l be later described; but omitted from the a mechanical details, the motor is'-wired to-the controller switch'for the appropriatespeedcontrolby connections to the two windings, for example; of

the shell type induction motor used-herein.

The vertically disposed spindle driving shaft 22 has its splined upper end-in splined driving connection with a sleeve 42, loosely rotatively-supported on spacedball bearings-435 '43,"fixed in a This sleeve has a shiftable compound gear element in splined connection with its upper end.

The compound gear incorporates an upper internal gear 46, adapted to mesh with the driving gear 33, and a lower spur gear 41 adapted to engage with a gear 48 of a second compound gear or back gear element 49 suitably journalled in the transmission'casing. The other-gear 50 of the back gear element 49 is in constant mesh with the upper portion of the driving gear 33 so -that the compound back gear element is being 'driven constantly while the motor is running.

The sleeve 42 is held in position against vertical'displacement on its bearings by means of a .-:nut' 5| screwed on the lower end thereof against Ttheinner race of the lower bearing 43. This nut draws abutment washers 52, 53, the first of which lies on the upper surface of the inner race of the upperbearing and is engaged by the second, namely 53, disposed in an annular groove 54 in the sleeve tightly against thetop surface of the inner race of the upper bearing 43. The upper' washer" 53 or the one fixed in. the sleeve serves as a support or stop for theshiftable compound gear 45, limiting its downwardrmovement flli to perfectmesh with the back gear. Therefore it will be understood that this shiftable compound gear, as shown in thexpresent embodiment, has two' positions, namely, upper or direct drive position, or lower or. back. geardriveiposition. The

number of positions of course canbeincreased as desired; The back gear49 is journalled in ball bearings 54, 54, suitably mounted in...the'transmission housing.

"Theyshiftable compound gear is operatedby means of a yoke arm- 55,: asza part.of:a s1ide 56 vertically slidably mounted in a' casingand: closure element 51 of the transmission housing. .The element" 51 includes a slideway 58xin. its. inner side for this purpose. -a lug 59 projecting into the'housing. Thexslideway includes overhanging flanges andrmaybeldescribed as a T-slot as viewed in top plan-view.

The slide 56 carrying the yoke has; ascross groove 60 in itslower end. A lever 6| pivoted on;

a the closure element 51 has one end carrying: a

roller 621engaged in said cross slot: or grooveSO, and its other end bifurcated to provide an operat- 'ing connection-as follows:

Ashaft 63 is mounted. horizontally through the t transmission casing and has its extremeinner'end coupled to the controller switch shaft by acoupling sleeve E54 (see FigureZ). .Its outer end is journalled. in .the closure element 51 passing throughthe casing portion thereof. This shaft ...'iS rotatedsbymeans of the .lever 28 hereinafter wdescribed'indetail. A back. gear operatingndisc 66 is pinned tothe shaft adjacentthe/innerside of the slide element, this .disc carryingra roller This slideway is formed in:

61 extended therefrom after themanneriofa iflo crank pin. This. roller is" ada-pted to engagerin the slotted or bifurcated end of the-lever'fil upon each: rotation of the 'disc, somewhat after the manner of a Geneva gear. The; bifurcation or slot in the end of the lever is widened for' o1ear- 1i5 ance purposes so that entrance and departure of the roller 61 will be facilitated.

A look or gear support element 68 is incorporated (see'Figure 8) for maintaining the shiftable gear 45 in either upper'or lower position,

particularly in'upper position-so that it will not fall under the-action of gravity. This element "extends from the hub of the'leverand is adapted to engage the hub 69 of the disc. The'outer end circular inner'lug Mbf-the: transmission casing. of the lock 'element' or arm is'of t-he following-75 shape. Arcuate surfaces H1, MI, are extended from a flat intermediate portion II to the side edges of the arm, these arcuate portions being described on a radius very slightly greater than the radius of the hub of the disc for the purpose of working clearance. The hub has a portion I2 flattened immediately adjacent the operating roller thereof. As shown in Figure 6, when the slide operating the gear is at its lowest position, the lower of the arcuate portions is engaged with the surface of the disc hub.

As the roller moves into the slot of the lever,

the flat portion of the hub of the disc moves adjacent to the arcuate portion just mentioned, thereby providing clearance and permitting rotation of the lock element and swinging move ment of the lever under the influence of the roller in the slot thereof. The lever swings to move the shiftable gear to its upper position, and as this upper position is reached the fiattened portion of the hub has passed. the lock element and the curve of the hub then engages the upper arcuate portion of the lock element, whereby it is impossible for the shiftable gear to drop until the operator moves the disc to place the flattened portion opposite or adjacent to the arcuate portion such as occurs'when reverse rotation of the disc is accomplished after a movement of the shift lever through the full range of speed.

The lever 28 which operates the back gear shifting disc and the switch is suspended from a pivot stud I3 within the casing portion of the slide element and at the upper end thereof. The manipulating knob or arm portion it of the lever depends downwardly through a slot I5 in the lower portion of the casing. The lever is made in two parts. The upper or pivoted part it is in the form of a segmental gear having its gear teeth engaging a spur gear I! pinned on the shaft, and the other or lower part it is bolted against the forward face of the first element and includes an arcuate slot It having its curve generated on the axis of the pivot of the lever and of a width fitting the hub 89' of the spur gear. This slot is of a length suificient to permit one full rotation of the disc and to limit movement of the lever to one full rotation.

The extreme outer end of the shaft carries an indicator finger 3i moving in relation to appropriate indicia 82 on the edges of a circular boss 83 on the forward face of the cover plate 3d of the casing. In the present arrangement provision is made for eight positions. This however can be modified to meet various demands. All of these positions are definitely located with ease by the operator, not only by noting the indicator finger but through the aid of detent grooves 85 in the disc engaged by a detent plunger ball 86 disposed in a lug 8? of the closure or casing element 51. The shift or control lever 28 may be on the outer end of the controller shaft 53 as shown in Figure 11 if desired.

The disengaged or intermediate position of the shiftable gear 45 finds the shift lever and shaft with the switch in position where the motor is being controlled for automatically slowing down the same so as to lessen. slashing of gears as they are engaged. The connection between the gear shifting slide and the operating shaft is shown as a form of Geneva movement, but it will be observed that it can take other forms such as intermittent gearing. Also a multiple Geneva movement may be used. or any other suitable device for accomplishing back gear shiftmore than once during a given revolution.

In other words, the present invention contemplates any number of mechanical gear changes in connection with. a multi-speed electrical motor control with an electrical controller making a cycle of motor speed change for each gear shift, that is to say, running through all its speeds each time a gear is shifted.

The motor control switch used herein controls the motor for four speeds as shown in R. P. M. from 450 to 1200. With the same speed of the spindle repeating the cycle of speeds with the back gear in mesh, spindle speeds of from 112 R. P. M. up to 300 R. P. M. (see Figure 11) are obtained.

Referring to Figure 12, the motor controller switch and motor are shown diagrammatically. Three power lines are provided, 88, 89 and Si), which power lines are connected to stationary contacts til, 92 and 93, of the controller switch. The motor incorporates two windings. The switch provides duplicate sets of contacts for the purpose of duplicating a range of four speeds in one rotation of the controller representing eight speeds on the dial as shown with interposed gear change.

The motor speeds are 450, 600, 900 and 1200 R. P. M. respectively. The first set of motor speeds are lowered to 112, 150, 225 and 300 R. P. M. respectively at the spindle when the back gear is in, but when the back gear is shifted the spindle speeds are stepped up in direct drive to the same speeds as the motor so that the increase in speed is uniform, ranging from 130 at the spindle to 1200 at the spindle.

With the indicator set at 450 R. P. M., namely, motor speed, 112 R. P. M. spindle speed, the connections are as follows: Contacts 98, 92 and 93 are in contact with rotating contacts as, 95 and 96 of the rotating switch element. These contacts are in electrical connection with other contacts 9?, 98 and Q9 of the controller in longitudinal alignment therewith. These latter contacts are in engagement with stationary contacts HID, IiiI and I62 of the switch, which contacts have motor leads IE3, IE4 and Iiiii extended therefrom to a winding I06 of the motor. These windings are delta connected. The last mentioned connections are tapped or delta toprovide a low motor speed. All the connections of the other winding It? are open, whereas leads I08, I09, lit and HI of the first mentioned winding E06 are connected through stationary contacts H2, H3, IM and H5, moving contacts H6, H1, H8 and H9, connections I29, HI and I22, andintermediate lead I23.

Moving the controller one step up to the second speed, the motor speed is increased to 600 R. P. M. and spindle speed to 150 R. P. M. At this position, as will be apparent, the moving contacts are, 125 and IE6 then engage the stationary power input contacts 99, 92 and 93. Leads Iiil, I28 and IE9 of the switch connect these last mentioned contacts to moving contacts I30, IEI and I32, which contacts then engage stationary contacts I 33, I34 and I35 of the switch. These last mentioned contacts are connected to the other winding IilI of the motor in tapped or partial delta connections by motor leads I 36, E31 and I33 respectively, this winding being suitable for providing a faster speed. All the connections of the other winding are then open, whereas the other connections to winding I01, namely I39, M0, MI and I42 are connected together through contacts partial I43, I44, I45 and I46, connections I20, I2I and I22 and interconnection I23.

Upon movement of the controller switch to the next position, namely 3, 900 motor R. P. M., 225 spindle R. P. M., the power input contacts 9|, 92 and 93 then are engaged by movable contacts I41, I48 and I49. These contacts are connected to other movable contacts I50, I5I, I 52 and I 53, which latter contacts engage stationary contacts II2, II3, H4 and H5, which contacts are as described extended to the delta connections of the winding I06 through the previously mentioned leads I08, I09, H and III. At the same time leads I03, I04 and I are open. All the leads of the other winding are also open.

At the next position, namely 4, 1200 motor R. P. M., 300 spindle R. P. M., the stationary input contacts 9|, 92 and 93, are then engaged by movable contacts I54, I55 and I56. These movable contacts are also connected to movable contacts I5'I, I58, I59 and I60 by the connections I21, I28 and I29. The last mentioned movable contacts engage stationary contacts IBI, I62, I03 and I64 respectively, which stationary contacts extend to the delta connections of the winding I0'I through leads I39, I40, MI and I42.

It will be observed that leads I36, I37 and I38 of winding I 01 are open as well as all the leads of winding I00. At this time the controller has been rotated 180 approximately. The other half of the rotation will duplicate the motor speeds just mentioned, but as the rotation reaches 180, the back gear shift is made coupling the motor shaft direct to the spindle shaft, and the spindle speeds are accordingly stepped up to motor speeds as indicated. Accordingly, the movable contacts wherever necessary are duplicated as will be observed by inspection of the spread out view of the controller cylinder.

In order to lessen clashing of the gears as the controller lever is moved to shift spindle speed from 300 R. P. M. to 450R. P. M. (position 4 to 5) through the gear shift, the movable contacts I30, I3I: I32, I40, I4I, I42, I43, I44, I45 and I46 are elongated so that they engage the contacts 9|, 92, 93, I00, IOI, I02, H2, H3, H4 and H5 at the time the mechanical gear shift is being initiated so that as the shiftable back gear reaches the point of mesh with the driven gear of the motor, the motor speed has been lowered to 450 R. P. M. lowest motor speed which is only slightly higher than the 300 spindle speed existing at the time of the shift.

It will be apparent that any one of a number of electrical devices may be used for lowering the motor speed, for instance, a reverse plugging contact to practically stop the motor or in the case of a D. C. motor, contacts causing dynamic braking.

Having described our invention, we claim:

1. In a shifting device including a controller shaft to be rotated and a gear carrying yQke to be slidably moved, a lever pivotally mounted, said lever having one end operatively engaging the gear carrying yoke and having its other end bifurcated, a disc mounted on the shaft, said disc carrying a crank pin element adapted to enter said bifurcated end of the lever for shifting the lever, a second disc mounted on the shaft, a locking arm as a part of the lever having arcuate surfaces engageable with the periphery of the last-named disc, said last-named disc including a flattened portion on the same side of the shaft as the crank pin adapted to clear the contact of the last-named disc and the locking arm when the lever is being shifted.

2. In a shifting device including a controller shaft and a shifting lever, a disc mounted on the shaft, said disc including means engageable with one end of the lever at one portion of the rotation of the disc for swinging the lever, a detent device coactive with the periphery of the disc for locating predetermined control positions of the controller shaft, and locking means for locking the lever against swing when said means on the disc is not engaging the lever.

3. In a shifting device including a controller shaft and a shifting lever, a disc mounted on the shaft, said disc including means engageable with one end of the lever at one portion of the rotation of the disc for swinging the lever, a detent device coactive with the periphery of the disc for locating predetermined control positions of the controller shaft, and a locking device for maintaining the lever in positions at its limits of movement, said device including elements an the lever and disc having curved surfaces rotatabiy nested throughout most 01'' the movement of the disc, said curved surfaces discontinued adjacent to the means on the disc engageable with the lever for permitting swinging of the lever.

4. A shifting device, comprising, a shaft, means for rotating the shaft, a shifting lever pivotally mounted, a disc having a crank pinthereon engaging a bifurcated end of the lever for shifting the lever, detent means cooperating with the i' disc for holding it at any one of a series of predetermined positions, interlocking elements on the lever and disc nesting during rotation of the disc relative to the lever for preventing swinging movement of the lever, said elements shaped to 

